using System;
using System.Threading.Tasks;
using UnityEngine;

namespace DDD
{
    public class UiManager : Singleton<UiManager>, IManager, IGameFlowHandler
    {
        [SerializeField] private Transform _hudRoot;
        [SerializeField] private Transform _interactionUiRoot;
        [SerializeField] private Transform _popupUiRoot;
        [SerializeField] private Transform _commonUiRoot;

        public UiData UiData => GameData.Instance.UiData;
        public UiState UiState => GameState.Instance.UiState;

        private void OnDestroy()
        {
            GameFlowManager.Instance?.FlowHandlers?.Remove(this);
        }

        public void PreInit()
        {
            ClearAll();
            
            GameFlowManager.Instance.FlowHandlers.Add(this);
        }

        public Task Init()
        {
            var flowToUiMapping = UiData.FlowToUiMapping;
            foreach (var flowToUis in flowToUiMapping)
            {
                if (flowToUis.Key == GameFlowState.All)
                {
                    foreach (var ui in flowToUis.Value)
                    {
                        var uiType = ui.UiType;
                        var root = GetUiRoot(uiType);
                        UiState.CreateUi(ui, root);
                    }
                }
            }
            
            return Task.CompletedTask;
        }

        public void PostInit()
        {

        }

        private void ClearObjects(Transform root)
        {
            foreach (Transform child in root)
            {
                Destroy(child.gameObject);
            }
        }

        private void ClearAll()
        {
            ClearObjects(_hudRoot);
            ClearObjects(_interactionUiRoot);
            ClearObjects(_popupUiRoot);
            ClearObjects(_commonUiRoot);
        }

        public Task OnReadyNewFlow(GameFlowState newFlowState)
        {
            var flowToUiMapping = UiData.FlowToUiMapping;
            foreach (var flowToUis in flowToUiMapping)
            {
                if ((flowToUis.Key & newFlowState) != 0)
                {
                    foreach (var ui in flowToUis.Value)
                    {
                        var uiType = ui.UiType;
                        var root = GetUiRoot(uiType);
                        UiState.CreateUi(ui, root);
                    }
                }
                else
                {
                    foreach (var ui in flowToUis.Value)
                    {
                        UiState.DestroyUi(ui);
                    }
                }
            }
            return Task.CompletedTask;
        }

        public Task OnExitCurrentFlow(GameFlowState exitingFlowState)
        {
            return Task.CompletedTask;
        }

        public Transform GetUiRoot(UiType uiType)
        {
            return uiType switch
            {
                UiType.Hud => _hudRoot,
                UiType.Interaction => _interactionUiRoot,
                UiType.Popup => _popupUiRoot,
                UiType.Common => _commonUiRoot,
                _ => throw new Exception("UiType 설정 오류")
            };
        }
    }
}